Question

how are esters formed ?

Answer 1

Esters are formed when carboxylic acids are heated with alcohols in the presence of an acid catalyst. The catalyst is usually concentrated sulphuric acid. Dry hydrogen chloride gas is used in some cases, but these tend to involve aromatic esters (ones where the carboxylic acid contains a benzene ring).

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Answer 2

Esters can be formed as:
when alcohol reacts with carboxylic acid then Ester and water is formed
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